condition mean min max ZT0-3 13.941711075 11.965707590000001 15.91771456 ZT4-7 8.9665603115 7.888854274 10.044266349 ZT8-11 11.6269261045 7.6557713475 15.598080861500002 ZT12-15 18.359459477500003 17.445964070000002 19.272954885 ZT16-19 16.254647272499998 15.745178155 16.764116389999998 ZT20-23 15.84128664 14.6852052 16.99736808